Well, the truth is... regardless of what some hippy who has done way too much acid in his life may "seem" to think, Rosenthal uses no science at all. Everything is stoner mentality. Where as there are actual SCIENTIFIC EXPERIMENTS that PROVE beyond a shadow of a doubt that higher N at the end of flower = LOWER THC levels. Proven with science, not some stoner saying "heh heh, dude, this seems like it is better, heh heh.
Rosenthal is an idiot, even his book has very very little coming from Rosenthal, just stupid little quips.
"you can tell a plant is ready because the buds glisten and have an aroma" - Rosenthal....
Oh, so my buds are ready around week 4?